[GHC] #14948: A program which benefits from a late specialisation pass

[GHC]

#14948: A program which benefits from a  late specialisation pass
-------------------------------------+-------------------------------------
           Reporter:  mpickering     |             Owner:  (none)
               Type:  bug            |            Status:  new
           Priority:  normal         |         Milestone:
          Component:  Compiler       |           Version:  8.2.2
           Keywords:                 |  Operating System:  Unknown/Multiple
       Architecture:                 |   Type of failure:  None/Unknown
  Unknown/Multiple                   |
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):                 |         Wiki Page:
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 In this repo there is a small program which performs much better with a
 late specialisation pass. There is a plugin which implements this pass.
 Instructions about how to build the repo are in the README.

 https://github.com/mpickering/legendary-train

 Without plugin

 {{{
 time benchmarks
 ()
 real    0m0.112s
 }}}

 With plugin (comparable to hand-written code)

 {{{
 time benchmarks
 ()
 real    0m0.049s
 }}}

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14948>
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